I have started to fancy a guy who used to be my employee.  I left the company a few weeks ago and just before I left, I started to fancy him.  We have always got on amazingly well and he is very good looking.  As I was his boss (for 6 months), I kept my emotions in check, but now I feel like I want to let him know how I feel. 

There are a couple of problems.  1.  I am 32 and he is 21. 

He's more likely to be in the territory of using you to gain some experience at that age difference.  The only thing that increases your chances of a long term relationship is if you look 10 years younger than your age.

2. I dont know how to let him know that I like him? 

First of all, you need to get some time alone with him or time outside of his workplace. 

3.  I dont know how to tell if he likes me?

Spending time with him should give you a good idea.  Watching his reactions and watching what he says to you. 

We always go out with the rest of the team (who I was Managing).  They are all guys, so I cant really single him out too often for fear of the others noticing.

He hasnt been seeing anyone for months now and he has a really mature and unusual way of seeing things and I dont think he connects with girls his own age. 

Sounds like he has an older mind that people his age, so this increases your chances.  Again though the warning bells sound in my head that he might use you to gain a bit of experience.  He'll more than likely be interested in a bit of sex.  And I'm sure his work colleagues, being all men, would encourage him to get stuck in there, unless they fancy you, then it might be more a competition for who gets into your knickers first.

It sounds to me he is one of the more reserved guys and for that reason he maybe more of a challenge.  He will probably think you won't fancy him because of his age, but equally because he's not one of the lads, he will expect you to fancy one of the other guys.  And the fact that when you go out there's loads of competition for you, he will think, there's little point in making a move on her, what's the chance of me being successful in amongst these guys.  And what's the chance of one of the other guys muscling me out and humiliating me. 

I am quite quirky myself, so we always make each other laugh, but also discuss serious things.

It sounds as though you are already getting some good conversation, at this stage I think you should continue that and see how it progresses.  You need more time before he and you can decide you really need to have a date together.  Having a laugh with each other increases your chance.  Maybe a light touch of his leg or arm occassionally might turn on his sexual attractiveness brain cell.  And from his reactions there, that will give you an indication of whether he's interested. 

I'm not sure what to do, but I cant stop thinking about him and feel like a love struck teenager when we are out together.

What do you think I should do?

Make sure you continue to be out there.  But also try and find some common hobby that you could hint about.  For example you might like the theatre and he might like the theatre.  You could hint that such and such is in on at the theatre but none of my friends like going, so I can't go, hint hint hint.  That sort of scenario.