Etymonline
Obsolesce - from L. obsolescere "to grow old, fall into disuse" inchoative of obsolere".
Obsolescence - first used in 1828;
Obsolescent - 1755, from L. obsolescentum (nom. obsolescens), prp. of obsolescere "fall into disuse".
Obsolete - 1570s, from L. obsoletus "grown old, worn out," pp. of obsolescere "fall into disuse".
Phrase planned obsolescence is attested from 1966.
(http://www.etymonline.com/index.php?l=o&p=2)
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