preposition + determiner + plural numeral – English Grammar Profiler
Here’s an example of the time phrase that means the person is at the age of 20-29:
I‘m not even in my twenties anymore.
NSFW
This phrase is B2 in the English Vocabulary Profile:
(be) in your eighties
to be aged between 80 and 89the eighties
the years from 1980-1989
A search in iWeb corpus for:
_I _A _MC2
1 IN THE 1980S 57549 2 IN THE 1970S 56687 3 IN THE 1960S 49883 4 IN THE 1990S 45235 5 IN THE 1950S 40646 6 IN THE 1930S 28628 7 IN THE 1920S 22817 8 IN THE 80S 20687 9 IN THE 90S 18171 10 IN THE 70S 17104 11 IN THE 1940S 16073 12 OF THE 1960S 12811 13 IN THE 60S 12789 14 OF THE 1980S 11083 15 OF THE 1970S 10148 16 OF THE 1990S 9090 17 IN THE 1800S 8364 18 OF THE 1950S 7878 19 IN THE 50S 7757 20 DURING THE 1980S 7662 21 IN THE MID-1990S 7614 22 IN THEIR 20S 7596 23 OF THE 1930S 7408 24 DURING THE 1970S 6421 25 DURING THE 1960S 6215 26 OF THE 80S 6061 27 DURING THE 1990S 6022 28 FROM THE 1960S 5964 29 IN THE 1880S 5765 30 FROM THE 1950S 5668 31 DURING THE 1950S 5249 32 FROM THE 1970S 5248 33 OF THE 1920S 5223 34 IN THE SIXTIES 5085 35 OF THE 90S 5024 36 IN THE 1890S 4998 37 IN THE 2000S 4529 38 IN THE 1870S 4440 39 FROM THE 1980S 4313 40 IN THE 1860S 4305 41 OF THE 70S 4222 42 IN THE SEVENTIES 4221 43 IN THE 1850S 4183 44 DURING THE 1930S 4172 45 OF THE 60S 4107 46 IN THE EIGHTIES 4053 47 IN THEIR 30S 4013 48 FROM THE 1930S 3999 49 FROM THE 80S 3877 50 IN THE 80 3858 51 IN MY 20S 3608 52 DURING THE 1920S 3569 53 IN THE TENS 3475 54 FROM THE 1920S 3448 55 IN THE 1830S 3441 56 IN THE 40S 3386 57 IN THE 1840S 3346 58 FROM THE 70S 3316 59 IN THE 1970 3294 60 IN THE 1700S 3293 61 IN THE 30S 3263 62 IN HIS 20S 3172 63 IN THE 1980 3167 64 IN THEIR 40S 3046 65 IN THE 70 3029 66 IN THE 1960 3015 67 IN THE MID-90S 2969 68 IN THE 90 2962 69 IN THE NINETIES 2921 70 TO THE 1970S 2845 71 FROM THE 1940S 2796 72 OF THE 1940S 2788 73 FROM THE 60S 2739 74 IN THE FIFTIES 2662 75 IN THEIR TWENTIES 2662 76 OF THE SIXTIES 2636 77 IN THE 1950 2605 78 IN THE MID-2000S 2577 79 TO THE 1980S 2574 80 TO THE 1960S 2559 81 IN THE 20S 2556 82 IN THEIR 50S 2523 83 FROM THE 90S 2489 84 IN THE 1600S 2425 85 OF THE 2000S 2413 86 IN HIS 30S 2310 87 IN YOUR 20S 2310 88 TO THE 1950S 2301 89 IN THE 1990 2212 90 FROM THE 1990S 2204 91 BY THE 1980S 2130 92 BY THE 1970S 2113 93 IN THE 1930 2086 94 IN THE 1820S 2082 95 IN MY TWENTIES 2081 96 BY THE 1960S 2051 97 IN THE MID-1800S 2036 98 DURING THE 1940S 1963 99 OF THE 50S 1941
100 IN THE 60 1904