I am doing manstrubation since 15 yrs age now I'm 29 yrs. I am now facing problem while doing sex with my wife. Sex strength is almost lost. What should I do.

You need to stop masturbating .
Your body has become used to the act of instant gratification.
That is not something you can easily achieve with a partner.
You need to retrain your brain to be stimulated with a partner.
In order to do that you need to stop masturbating or at least limit your masturbation.
Try that for a week and see if your sex with your wife improves.

I had the same problem a few months ago. It gets better the more sex you have. Get a herbal remedy for limp , this will get you hard. Use it a few times until you get use to having sex with your wife again and then you can stop using it.

Also control when you masterbate. Do it at least 5 hours before she gets home. Or wait until she is sleeping if you really want to do it. I shot myself in the foot via doing the deed then girly gets home and wants some love... and then presto... I can't get it up.

This had to stop and it did otherwise my girl would have most likely left me in the long run.