10 Bitcoin for sure? I think that isn't enough after all for retiring for 20 years. But if the price of bitcoin is going to be $10,000 by that time.
But we can't tell what will going to be price of bitcoin by that time.
But just to be sure it is better if you are going to have hundreds of bitcoin by that time.
The bitcoin price will be at least $0.5 million in 20 years. I think the price will double every two years in the next 20 years.
Exactly $0.5 million is something difficult to achieve but bitcoin surely have an potential to achieve the price of $10k in future, and even if it achieves price of $5k then I would be happy if I am holding 50 bitcoins.