senescent

adjective

1. growing old; aging.
2. Cell Biology. (of a cell) no longer capable of dividing but still alive and metabolically active.

adjective

1. growing old
2. characteristic of old age

adj.1650s, from Latin senescentem (nominative scenescens), present participle of senescere “to grow old,” from senex “old” (see senile). adj.

1. Growing old; aging.