33 vs 19

What's your thoughts on an 33yr old man sending 18 & 19 yr old friend request on facebook and following them on Instagram.

Me personally I feel like there isnt anything a 33yr old have in common with a teenager and I feel its inappropriate period and inappropriate in a relationship. What do u guys think about this??

UPDATE:

He also has a 2 yr old and 8yr old daughter. I'm very uncomfortable honestly.