Ia our sun groing old before its time

With the biggest solar flares in years one could ask himself if our sun is
groing older than it should be.

We all know that it will become a giant red but some sat in 4.5 billion
years and some say in only a few thousand.

If I only rely on my astronomy courses it shoud be 4.5 billion years.

Has someone got some more insight?

Thanks

Pete!