Sex with old man

No, but it might be harmful to him depending on his cardiac health.

If you are female...

...sex with old men is great. But you really should try for a Guinness kind of age differential, especially if you like kinky sex.

If you are male...

...sex with old men is problematic.

Nope, as long as you're a woman! Define "old man" also?

In a sense, you made a charitable contribution by making the old guy pretty happy. It is probably not very often that he beds a young babe (assuming you are a babe.)

Like, what is he ? Thirty? OMG!!

Actually, you are well served by an old guy. He can keep at it for a much longer time without cumming. No premature ejaculation with him.