Am I too old to start?

Hi,

I am a 30 y.o., 190cm height and 88kg weight guy who has got interested in Judo, and want to train as an amateur, for general fitness and to get self defense techniques. I have done some karate and muai thai when I was a kid, but now I would not say I have good fitness condition and seeing how judokas fight, I need to train neck and back to handle the pressure.

Is it ok for this age and condition to start judo and get skills if trained for hobby?

Thank you!