WBU champion Enzo Maccarinelli has challenged rival cruiserweight David Haye to fight someone his own age. Haye beat 39-year-old Arthur Williams in May and next faces veteran IBO champion Carl Thompson, 40, next month.
Maccarinelli defends his title against Denmark's Jesper Kristiansen on 3 September in Newport.
And the Swansea man said: "Leave the OAPs alone - fight a real fighter.Haye is living in dreamland and I would love to bring him back to reality."
Maccarinelli is hoping that a win over Kristiansen will lead to a December showdown with WBO champion Johnny Nelson.
But the Swansea fighter says there is still room for a clash with fellow 23-year-old Haye.
"I am seriously worried about Haye so I reported him to Age Concern, because he is a real danger to the older generation," Maccarinelli added.
"First it was Williams and next up it will be Thompson - where will it stop? The answer is it won't until he fights me.
"But he won't fight me because he knows that I will match him and better him for size, strength, speed, power and skill and will fight back.
 | Haye is living in dreamland and I would love the chance to bring him back to reality  |
"He will get a taste of his own medicine and he won't like it."
Haye emerged as one of the darlings of the last Commonwealth Games in Manchester, while Maccarinelli was busy building his reputation in the professional game.
Haye has won all 10 of his professional fights by knock-out, while Maccarinelli has 13 KOs and a single loss in his 19-fight career.
Both fighters are hugely talented and powerful and a match-up between the pair could well be a classic.
That is before the traditional English-Welsh rivalry and the growing animosity between the pair is factored in.
"Haye is disrespectful towards the world champions of the division and I can't stand that either," Maccarinelli said, raising the temperature further.
"How can he say he will beat the IBF world champion Kelvin Davis in November?
"Don't come up with excuses that I won't fight you for 18 months, I'll fight you right now."
The reality is that the boxing public will have to wait for a chance to see the two clash.
But that match-up is likely to become a very real possibility should Haye claim the IBO or IBF titles and Maccarinelli add the WBO belt to his WBU crown.