Related Clues:

• Wise men having no leader for years
• Isn't getting any younger
• Forever, basically
• "Forever"
• Becomes ripe
• Long time periods
• '___ 8 and up'
• "Rock of ___"
• The 13 of PG-13 and 17 of NC-17
• Long spans
• Seasons, as wood
• A long time (colloq.)
• Guru lowers head for a long time
• Vast ages
• Agrees about being dropped as one grows older