買/租單位合法年齡?

to buy or sell : no
but to ask for a mortgage when you buy a flat : yes

becuase bank will see you if you can still work in the next
twenty years. If you are 55 years old, you can only do five years mortgage
because you will retire soon
If you are 25 years old, you can do 20 years or even 30 years
mortgage