Ryan Giggs says he is "still enjoying" his football, and "as long as that is the case I will carry on."
The Welshman turns 40 today, and has been playing for Manchester United for 23 years.
"I don't really think about it age-wise. Every year is a bonus", he said. "You don't start out and think you'll still be playing when you're 40 - but I'm enjoying it."
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More than a thousand riders will be taking part in a series of events in and around the town.
Some warm spells of sunshine will develop, although scattered heavy and thundery showers are also expected during the afternoon.
A yellow 'be aware' warning has been issued by the Met Office for much of Wales.