68.
Virtually unique
Older/ younger relationships tend to be associated (at least in the popular gay mind) with the world of rent boys. The Quebec shows that this need not be so. Another reviewer puts it at about 3 per cent rent and I would agree. 30 years ago, when I was in my early 20s, I found it both friendly and fascinating (lots of ex-fighter pilots from WW2!). It still is.
Love for sale.
Unfortunately, there does not appear to be Berlin bar for young/older which is NOT a rent bar. But I go here from time to time and hope!