It is legal, so it is not wrong.
NO! What is so wrong about it? Everyone is equal!
Of course not.
No.
The oldest man on earth I heard was 113 years old. Then there's the oldest woman and she was 114 years old. The oldest man is 120 and woman was 114
Physically, yes. Is it advisable? No.
'Age is just a number'
Wikipedia's oldest people article says that the oldest woman was 122 years and 164 days old and the oldest man was 120 years and 237 days old. The man's age however has had some dispute. If the 120 year old man's age wasn't true, then the oldest man would be 115 years and 252 days old.
yes
Yes. Happens all the time.
That relationship is completely fine ethically and legally.
An octogenarian is a man or woman who is between 80 and 90 years old.