I'm struggling to come up with a concise response. I'll bullet point instead:
1. I've been in situations many situations in which my mother's friends would overtly come on to me. As an 18 year old busy chasing all the 18 y/o tail I could find, I found this to be both flattering and really scary. It's intimidating to a certain degree and it's easy to feel used if you're in the young guy position.
2. I also met one older woman during the same time period -- someone I met through work -- on whom I had the biggest crush. I never acted on anything, and if there were any return feelings she didn't either, but wow -- she was SMART, sexy, independent, a total badass, hot, fun, etc... She also sprang for very lavish lunches regularly.
3. It's like any other relationship -- any side can take it farther than the other and get hurt in the process. I don't think it really matters what the age/maturity difference is -- actually, age doesn't really matter at all; it's the maturity difference you have to worry about. Be careful. Try to maintain some critical distance to assess whether he -- or you -- has unrealistic expectations. Assess whether you or he is trying to recapture (in your case) some percieved lost experience when you were younger or (in his case) some percieved lack of mothering from when he was younger. Make sure you aren't using one another to fill painful gaps in your personality that will remain after the relationship.
That said, don't overanalyze. Get lost in the moment but make sure you can find your way to reality (as in, objective, rational decision making) at all times.
And, because I'm amazed nobody has used this one yet:
Here's to you Mrs. Robinson!
I wish I had that kind of education...