Older people's attitudes to the young need to be tempered.
It's the young people of today who will be in charge when those who are at the forefront of complaining about them will be relying on them to provide for them in their dotage.
But to answer the question - no, the voting age should not be raised to 25, just as the age of consent shouldn't be dropped, just because studies have shown that the age of puberty has fallen.