Hang on in there:
I started to learn to fly age 48 with a view to getting my licence by age 50.
I had a !!!!!e first ten hours, but then it all seemed to come together aided I'm sure by having the same instructor for about 85% of my training (thanks Will)
I (thanks to a particularly mild English winter) got the licence in six months Oct-March.
That was 13 years ago and it just goes on getting better: I'm now retired and can fly all hours God sends instead of being at the mercy of weekends and on-call rotas.
Like everyone else has said four hours ain't nuffink: start to get worried when after 40 hours you're still not doing the take-off.
(only joking)
Safe flying
Cusco