Table 1. The age distribution of donors.

Age group	Number of donors	Percentage of donors (%)
<20	6	12
<30–⩾20	12	24
<40–⩾30	5	10
<50–⩾40	8	16
<60–⩾50	10	20
⩾60	9	18

Volunteers who donated the eyelid samples after plastic surgeries are all healthy females. Over 100 eyelid tissues were collected and fibroblast lines derived from them were established. Fifty cell lines were then randomly selected for this study