Afraid of dating 18yo, Im 29,

Looking for advise here, I'm 29, had a LTR for 5 years with someone a year older than me, he broked up two months ago and I saw myself mega lonely on hornet just chatting and started to date two weeks ago an 18 college bi guy, and I'm in a moment of my life where I might get a job after PhD is over overseas or in another state and im really devastated and nauseous with the word (boyfriend ot life partner), im going as slow as possible but there are times I just want to kiss him all day long... He has never been in a relationship and seems mature for his own age, Do you relate? Any advise? Thanks