Cool Late in Life birthday card

Is it better to get cool late in life or do we want to peak earlier? Each card is handmade with high quality acid-free cardstock using laser-printing, archival adhesive and embellishments. Cards are all blank inside and are shipped with a recycled envelope in a cellophane sleeve. [card size] 4.25 in x 5.5 in - A2 [envelope color] recycled kraft brown [envelope size] 4.375 in x 5.75 in - A2 [material] paper [inside] blank