Jo
Entering is not really an essential part of self defence. Usually if someone is attacking you then they will do the entering, so it is much more important to learn to get a good guard stance and cover, and if you are hit and you feel it ,to grab hold until your head clears.
Generally though you should be moving all the time, even when you are striking an opponent, you should be lining up attack angles, looking for openings and targets. You can train this with BOB, what you do is throw a left right combination, then step to the side and throw the same combo to the side of BOB, then move behind and do the same again, then make up your own combos and do them, use head butts knee kicks, whatever.
IMHO it doesn't matter a great deal what style you do, because all the best guys do the same thing, and I say this having studied many styles. The worst thing that you can do is be ponderous and slow, because if you train like that then that is what will come out, and it's not an age thing, I know we are all getting older, I'm 58.how did that happen

but I can still move quick , or at least my hands can.Really there is no excuse look at this guy
http://www.youtube.com/watch?v=4iJ_J88D ... watch-vrec