Riddle: I start at one, but I'm never alone. I grow slowly, but…

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i-am-a-number-thats-not-too-high-if-you-halve-me-im-a

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what-sequence-counts-without-numbers-starts-at-one-yet

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i-am-a-three-digit-number-my-tens-digit-is-five-more

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i-can-be-long-or-short-yet-never-change-in-size-i

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i-start-with-one-then-two-then-three-and-so-on-without