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Is he straining to urinate? Urinating normally?

Going in/out of the litter more often?

At this age...

And in a male cat...

This is typically not something that goes away and does not come back.

If there was something - enough - to cause blood in the urine

It is probably something real.

Causes?

1) Idiopathic Sterile Cystitis (LINK HERE)
2) Urinary tract infection
3) Bladder stones

Well worth having Gaffer evaluated by your vet.

Typically in these cases, aside from a good examination, a urine sample (Urinalysis - LINK HERE and possibly Urine Culture - LINK HERE) are performed helping to differentiate the causes listed above.

Ok - good luck.

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