The need for a "proper" job. More aggressive hangovers. The slow march of the receding hairline.
By our reckoning (we did a quick show of hands round the office) each of these pitfalls can be expected in a man's 25th year - the grand old age that Reebok's Ventilator trainer has now reached. Except, what with being a shoe, it won't have to contend with any of them.
Packed with new airflow technology and sporting credentials, the Ventilator began turning heads and cushioning ankles back in 1990 - standing the test of time thanks to its versatile build and a string of excellent collaborations and specials.
As Hanon reveals its new RTB model as stylish nod to the shoes 25th Anniversary, we've rounded up five of the finest Ventilators money can buy.