beardies really do make lovely pets, I bought mine a few weeks ago and I'm totally in love with him lol :-D As for the age to get them, I had some trouble deciding on this myself, but I'd recommend getting a baby. When buying an adult you can't be certain how well they have been cared for in the past, and I imagine it may take longer/be more difficult to bond with them. I also think that seeing them grow and develop their character is nice to watch. Enjoy
p.s Beardies can have supervised, shallow baths (with baby-warm water up to their arm pits I believe) to help them poop, make it easier for them to shed, and to clean them up. You can either use a soft toothbrush or a cotton bud to help get muck off (they can also be used to gently remove any remaining shed that may cause them probs/to loose toes or tip of tail but don't pull or force the dead skin off as it may cause damage - more of a last resort really).
Hope this helps