By Bill Wyman
Updated November 22, 1991 at 05:00 AM EST

Virtually alone among his 50ish contemporaries, Paul Simon continues to age gracefully. His last two albums — Graceland (1986) and, to a lesser extent, The Rhythm of the Saints (1990) — restored his musical, critical, and commercial credibility; and this year his grand-scale tour, combining elegant renditions of his old songs and rhythmically turbocharged new ones, was a delight. That outing’s climax — a free show by the full 18-member ensemble in Central Park last August — is preserved on a double album, Concert in the Park, which is pristinely recorded, good-natured, and — not least — eminently givable for the upcoming holidays. Only the Grinch will be able to resist the roaring onslaught of ”You Can Call Me Al,” the silky stillness of ”Born at the Right Time,” or the riveting drum barrage of ”The Obvious Child.” Aside from a rather lackluster arrangement of ”Kodachrome” and the way a couple of the quieter songs from ”The Rhythm of the Saints” get lost in the night air, this is an irreproachable set. A