It's that man again!! [Irritation hinted at for comic effect only. I am only irked by those who fail to use their minds, or who use them to the disadvantage of others.]
Some early versions of String Theory demanded (by symmetry) the existence of tachyons, which were the anti-particles of "normal" particles. One characteristic of a tachyon is that it moves at c.squared/v, where v is the velocity of their counterpart. So their speed range had to be between c and infinity. No evidence they exist, apart from some conjectured equations.
Remember that the time dilation effect is only true for the photon (or hypothetical object) moving at c. The rest of the universe (including the places the photon will visit) age normally while it is in transit. If you could fire me at some far-distant star at speed c, I will still be 61 when I get there, but it might by then be a red dwarf.