I went through all the fansites and they couldn't help me with your character's age and not account age.
http://www.tibia-stats.com/
This fansite is outdated won't show one of my characters appears to be inactive.
https://www.orcsearch.com/
This fansite doesn't show any character details besides experience in past week or year but didn't load for one of my characters.
https://mrthomsen.de/player/view/liviuh
This fansite says I died by a wyrm on 1/1/1970. Outdated. However shows some deaths.
https://guildstats.eu/
This fansite shows you minimal information about deaths not showing me my character in particular.
I feel like if you go the Tibia client -> Character -> Achievements You can go based off of those dates roughly to estimate or check letters in your depot or market history.
Ohmy a good way to see how long you've been offline training would be to do some sort of calculator. I prefer the Tibiastats calculator.
https://guildstats.eu/training-calculator
http://www.tibia-stats.com/index.php?akcja=skillCalc