The oldest coin I've been holding is Bitcoin alone and newer ones are memecoins. I am still hopeful to reach my target to get a whole Bitcoin though I don't have timeframe to really have it but as soon as I have it I'll post it here. It's not that easy to have that challenge knowing that I don't have enough money or weekly Bitcoin income to fill it in but yeah it is the only oldest coin I have for now.
Getting one whole Bitcoin is still possible, but it will depend on this things.
The amount of income that you're getting on a monthly basis, the amount of expenses on a monthly basis, and the amount of money that you're investing.
I guess it's pretty simple. If you're earning $1000/month and you're expenses per month is $500 then you have spare money of $500 and it's up to you now if you will invest all of it or not. If you will invest it all, it will take you at least 10 years (estimating the current price of Bitcoin) to get a whole Bitcoin. Of course that excludes the capital appreciation if you do DCA, but it can be lowered depending on the profits that you're getting.
I'm not quite sure why you prefer holding meme coins instead of other established or old coins out there. I also have a goal of getting a whole Bitcoin, but not my main priority. Profiting off of my investment is my main priority since that's our main goal as an investor.
