Brandon Cook’s – 5 yrs, $81 million (avg. $16,200,000)
Michael Thomas – 5 yrs, $96,250,000 (avg. $19,250,000)
Mike Evans – 5 yrs, $82,500,000 (avg. $16,500,000)
Julio Jones – 3 yrs, $66 million (avg. $22 million)
Of the above mentioned WRs, only Julio Jones (30) is older than Amari Cooper (25) and the more productive.

All those players are older than Cooper.