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See the options below:

In olden times is a bygone era.
OR Like in times gone by OR bygone days

Merriam Webster
olden adjective
: of or relating to a bygone era

Merriam Webster
days gone by
idiom
: days/times in the past : bygone days

• They have many happy memories of days gone by.

like or as in olden times, times gone by, days gone by, bygone days

Then there's the "super formal" one: in days of yore

Cambridge Dictionary
The conjunctions as and like have the same meaning when used in comparisons.
Like is a little more informal.

• Nobody understands him as I do.
• Nobody understands him like I do.

Like old times = colloquial American English. You hear it in movies.

"It would be great to hang around like old times". No in is needed.

See the options below:

In olden times is a bygone era.
OR Like in times gone by OR bygone days

Merriam Webster
olden adjective
: of or relating to a bygone era

Merriam Webster
days gone by
idiom
: days/times in the past : bygone days

• They have many happy memories of days gone by.

like or as in olden times, times gone by, days gone by, bygone days

Then there's the "super formal" one: in days of yore

Cambridge Dictionary
The conjunctions as and like have the same meaning when used in comparisons.
Like is a little more informal.

• Nobody understands him as I do.
• Nobody understands him like I do.

Like old times = colloquial American English. You hear it in movies.

"It would be great to hang around like old times".

No in is needed.

See the options below:

In olden times is a bygone era.
OR Like in times gone by OR bygone days

Merriam Webster
olden adjective
: of or relating to a bygone era

Merriam Webster
days gone by
idiom
: days/times in the past : bygone days

• They have many happy memories of days gone by.

like or as in olden times, times gone by, days gone by, bygone days

Then there's the "super formal" one: in days of yore

Cambridge Dictionary
The conjunctions as and like have the same meaning when used in comparisons.
Like is a little more informal.

• Nobody understands him as I do.
• Nobody understands him like I do.

Like old times = colloquial American English. You hear it in movies.

"It would be great to hang around like old times". No in is needed.

See the options below:

In olden times is a bygone era.
OR Like in times gone by OR bygone days

Merriam Webster
olden adjective
: of or relating to a bygone era

Merriam Webster
days gone by
idiom
: days/times in the past : bygone days

• They have many happy memories of days gone by.

like or as in olden times, times gone by, days gone by, bygone days

Then there's the "super formal" one: in days of yore

Cambridge Dictionary
The conjunctions as and like have the same meaning when used in comparisons.
Like is a little more informal.

• Nobody understands him as I do.
• Nobody understands him like I do.

Like old times = colloquial American English. You hear it in movies.

"It would be great to hang around like old times". No in is needed.

See the options below:

"In olden times is a bygone era. OR Like in times gone by OR bygone days
Merriam Webster

olden adjective
Synonyms of olden
: of or relating to a bygone era

Merriam Webster
days gone by idiom : days/times in the past : bygone days They have many happy memories of days gone by.

like or as in olden times, times gone by, days gone by, bygone days

Then there's the "super formal" one: in days of yore

Cambridge Dictionary
The conjunctions as and like have the same meaning when used in comparisons. Like is a little more informal.

Nobody understands him as I do.

Nobody understands him like I do.

Like old times = colloquial American English. You hear it in movies.

"It would be great to hang around like old times". No in is needed.

See the options below:

In olden times is a bygone era.
OR Like in times gone by OR bygone days

Merriam Webster
olden adjective
: of or relating to a bygone era

Merriam Webster
days gone by
idiom
: days/times in the past : bygone days

• They have many happy memories of days gone by.

like or as in olden times, times gone by, days gone by, bygone days

Then there's the "super formal" one: in days of yore

Cambridge Dictionary
The conjunctions as and like have the same meaning when used in comparisons.
Like is a little more informal.

• Nobody understands him as I do.
• Nobody understands him like I do.

Like old times = colloquial American English. You hear it in movies.

"It would be great to hang around like old times". No in is needed.