How to know if tokens are more than a year old?

I recently made a mistake and sold holdings that I thought would produce long term gains, but discovered it accurately produced short-term gains. Is there a reliable way to know how old the tokens are that I’m about to sell?

CT is able to claculate my tax consequence immediately after a transaction, so wouldn’t it be possible to preview this calculation before submitting the transaction? I found one other investment site that has this feature called ‘Tax Impact Preview’, but they do not support crypto.
I understand CT is overwhelmed with growing pains and is in no position to offer this ability in the near future. Has anybody found this feature elsewhere?