Being three shouldn't have prevented you from being a train. There are plenty of trains older than that (some googling suggests the oldest 'living' train may be

Being three shouldn't have prevented you from being a train. There are plenty of trains older than that (some googling suggests the oldest 'living' train may be 161 years old right now, although admittedly it spends most of its time in a museum right now.) There is still hope :)