DHARMSALA, India (AP) — The Dalai Lama celebrated his 88th birthday on Thursday, as hundreds of his supporters and exiled Tibetans thronged his hillside Indian headquarters in Dharamsala. Artists played traditional welcome tunes as the Tibetan spiritual leader arrived in his open mobile van to preside over the celebrations in the courtyard of the Tsuglakhang Temple, which was festooned with Tibetan and Buddhist flags and portraits. “We are celebrating my 88th birthday but look at me, I look barely 50,” the Dalai Lama said, smiling. He has made the hillside town of Dharmsala his headquarters since fleeing from Tibet after…