In a 100 years, every thing around you within your eye sight, be it human (your children) or materialistic (your car, home, possessions, books etc.) will be gone...POOF...... decayed and rotted.
In fact your own existence won't matter to anyone really and unless you're some kind of superstar in your field of expertise no one will remember you.
That's just the facts. Only thing you can change is how you live your life TODAY. The future will get here whether you worry about it or not. It's outside your sphere of influence so worrying is futile. Just deal with it.
Best you can do is eat, drink, get laid and love as much as you can. Never seen an armored car being towed behind a hearse. So enjoy live now! It's the best revenge.