Like so many skin concerns, the first cause of crepey skin is time and age – specifically the decline in cellular function. This decline leads to slower production of proteins such as collagen and elastin, which help keep skin looking full and fend off fine lines. As we age, stem cell function—which helps with cellular turnover and replication—declines. This means that with time, the body produces fewer healthy skin cells which can lead to visible signs of aging like crepey skin.