I feel like for Rudeus, if he was like... 20 when he died, we could gloss over things a little bit (still kinda yuck though, like the college guy cruising for high school girls.), but 34 is just a bridge too far.

In the most recent chapter of the isekai pharmacist manga the MC actually addresses that situation after an examination was mistaken for a proposal by a friend. Dudes like "I'm 12, I'm way too young for romance."