septuagenarian

noun 0.756

sixtysomething

noun 0.755

octogenarian

noun 0.631

nonagenarian

noun 0.613

sixtieth

noun 0.608

sexagesimal

noun 0.603

sextic

noun 0.596

sextuple

noun 0.578

sixty-second

noun 0.575

sixty-eighth

noun 0.557

sixty-ninth

noun 0.557

fiftysomething

noun 0.556

sixer

noun 0.555

sixty-fourth

noun 0.550

sexto

noun 0.547

senex

noun 0.547

senior citizen

noun 0.539

sextile

noun 0.539

sextet

noun 0.538

sixte

noun 0.537

sixty-fifth

noun 0.536

sextuplet

noun 0.530

sixth

noun 0.527

centenarian

noun 0.523

half dozen

noun 0.509

half-century

noun 0.504

eighty-sixth

noun 0.501

6mo

noun 0.501