if someone holds 1btc from 2015 till date, how many btc will the person will be holding currently base on current Bitcoin values
In terms of Bitcoin, 1 Bitcoin in 2015 would still remain 1 Bitcoin in 2025. It never changes, not except you top your portfolio or liquidate it.
In terms of value, there you could spot a whole lot of difference.
In 2015, Bitcoin was valued around $315 for a Bitcoin and in today, we have over 365% of it. That tells you where yo should be putting your money. This is over 10years interval though but, the profit worths all the time spent waiting.