On the photo to the right you can see the difference in size between my smallest and largest varieties. To the right is the all green variety, my oldest variety of Spider Plant. In the middle is my next oldest, the one with white stripes in the middle of the leaves. To the left is my fourth variety, the smallest one with white stripes in the middle of the leaves. Older plants usually gets repotted at least once a year.
Older plants get bigger.
I guess some of my big plants are over 10 years old, some even may be almost 20 years old. The colour these plants will have depends upon the strength of the light they get. I have 5 different varieties, of which I have had 2 since around 1970. I got sometime after 1980. The fourth variety I got in 1998 from a friend.