Is it even possible to push a single button 50 Million times in your lifetime.
Lets do the maths
50,000,000 divided by 50 years is 1,000,000 per year
1,000,000 divided by 365 days is 2739.726 clicks per day.
If you can manage to spend every day pushing the same button 2739 times for the next 50 years, you keyboard deserves fail.