Valmiki Ramayana Ayodhya Kanda Sarga 6 Shloka 21
Original Shlokaअहो महात्मा राजाऽयमिक्ष्वाकुकुलनन्दनः। ज्ञात्वा यो वृद्धमात्मानं रामं राज्येऽभिषेक्ष्यति।।2.6.21।।
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यः that king, आत्मानम् himself, वृद्धम् aged, ज्ञात्वा having realised, रामम् to Rama, राज्ये in the kingdom, अभिषेक्ष्यति is going to install, अयम् this, इक्ष्वाकुकुलनन्दनः causing delight to the Ikshvaku race, राजा king , महात्मा highsouled, अहो oh.
Oh having realised that he himself has grown old the highsouled king Dasaratha the veritable delight to the Ikshvaku race, is going to coronate Rama in the kingdom.