rs, pl. rar, m. [Ulf. alþs = αιών or Lat. aevum; Engl. old; Germ. alter], age, life, period, old age, everlasting time.

1. age, life-time, Lat. vita, aetas; hniginn at aldri, stricken in years, Eg. 187; hniginn á aldr, advanced in years, Orkn. 216; ungr at aldri, in youth, Fms. iii. 90; á léttasta aldri, in the prime of life, v. 71; á gamals aldri, old, iii. 71; á tvítugs, þrítugs aldri, etc.; hálfþrítugr at aldri, twenty-five years of age, Eg. 84; vera svá aldrs kominn, at that time of life, Fs. 4; hafa aldr til e-s, to be so old, be of age, Fms. i. 30; ala aldr, to live, v. ala, Fs. 146; allan aldr, during the whole of one’s life, Ver. 45; lifa langan a., to enjoy a long life, Nj. 252.

2. old age, senectus; aldri orpinn, decrepid, lit. overwhelmed by age, Fms. iv. 233, xi. 21; vera við aldr, to be advanced in years.

3. manns aldr is now used = generation; lifa marga manns aldra, to outlive many generations: sometimes denoting a period of thirty to thirty-three years.

4. seculum, aevum, an age, period; the time from the creation of the world is divided into six such ages (aldrar) in Rb. 134: cp. öld.

5. eternity; in the phrase, um aldr, for ever and ever; mun ek engan mann um aldr (no man ever) virða framar en Eystein konung, meðan ek lifi, as long as I live, Fms. vii. 147, Th. 25; af aldri, from times of yore, D. N. ii. 501; um aldr ok æfi, for ever and ever, Gþl. 251, N. G. L. i. 41.